Fluorinated Nonflammable In Situ Gel Polymer Electrolyte for High-Voltage Lithium Metal Batteries

Rechargeablelithium metal batteries (LMBs) offer excellent opportunitiesfor applications requiring high-energy-density battery systems. Sofar, it has received a lot of interest in pairing higher-energy-densityhigh-voltage nickel-rich cathodes. Here, fluorinated solvents wereused instead of the usual carbonate solvents to prepare gel polymerelectrolytes (FGPE) by in situ polymerization of polymers introducingthe fluorine-containing groups. Theoretically and experimentally,FGPE has proven to be ultra-compatible with the lithium metal anodeand LiNi0.8Co0.1Mn0.1O2 cathode. A stable plating/stripping process of over 2000 h can beachieved for symmetrical lithium cells using FGPE. The Li||FGPE||NCM811cell has a longer cycle life at a high voltage (4.5 V). In addition,the zero self-extinguishing time indicates that the FGPE has sufficientsafety. In summary, the design of this electrolyte provides ideasto improve the safety and energy density of LMBs.

Automated summary

Rechargeable lithium metal batteries (LMBs) show promise for high-energy-density battery systems. Fluorinated solvents were used to prepare gel polymer electrolytes (FGPE) that are compatible with both the lithium metal anode and LiNi0.8Co0.1Mn0.1O2 cathode. FGPE demonstrated stable plating/stripping processes and sufficient safety. This electrolyte design provides ideas to enhance the safety and energy density of LMBs.